Tools: hv: fix file overwriting of hv_fcopy_daemon

hv_fcopy_daemon fails to overwrite a file if the target file already
exits.

Add O_TRUNC flag on opening.

Signed-off-by: Yue Zhang <yuezha@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/hv/hv_fcopy_daemon.c b/tools/hv/hv_fcopy_daemon.c
index fba1c75aa484..8f96b3ee0724 100644
--- a/tools/hv/hv_fcopy_daemon.c
+++ b/tools/hv/hv_fcopy_daemon.c
@@ -88,7 +88,8 @@ static int hv_start_fcopy(struct hv_start_fcopy *smsg)
                 }
         }
 
-        target_fd = open(target_fname, O_RDWR | O_CREAT | O_CLOEXEC, 0744);
+        target_fd = open(target_fname,
+                         O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0744);
         if (target_fd == -1) {
                 syslog(LOG_INFO, "Open Failed: %s", strerror(errno));
                 goto done;